They have between $200,000 and $400,000 stashed away in 529 college savings plans for their daughters Malia and Sasha.

4. President's books not bestsellers anymore

Over the years, most of the Obamas' wealth has come from the President's bestselling books "Dreams from my Father" and "Audacity of Hope."

However in 2013, a lot fewer books were sold. Royalties from those sales came in no more than $165,000, a far cry from $1.1 million in 2010, according to the disclosure.

The president earns a salary of $400,000 for his day job.

Last month, the Obama's federal income tax showed joint income of $481,098. They paid $98,169 in total tax.

Vice President Joe Biden and his wife were worth between $276,000 and $943,000.

In 2013, they refinanced property and locked a lower mortgage interest rate of 3.375%, down from their previous rate of 4.62%, on their home which is worth up to $1 million. The Bidens also refinanced a home equity loan rate down to 2.75% from 4.49%.